What material is often used in attic ventilation systems?

The common material used in attic ventilation systems is metal mesh. This choice is correct because metal mesh is designed to allow airflow while preventing the intrusion of pests such as birds and insects. Its durability ensures that it can withstand environmental conditions without degrading over time. Proper ventilation is crucial in attics to manage moisture and heat, which can damage the roofing structure and insulation.

In contrast, plastic sheeting is typically used as a vapor barrier rather than a ventilation component. Treated wood panels may be appropriate for structural elements in a building but do not serve the specific function of enhancing air movement in ventilation systems. Insulation foam is primarily used for thermal insulation, which does not align with the purpose of facilitating airflow in an attic setting.